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If the graphic displays then it is installed correctly. If not there should be an option to install it to your computer. Once installed try loading Yahoo mail again. Another option would be to download a different browser such as Firefox or Chrome to test them for Yahoo mail functionality. Post a reply with your results if this solution doesn't work. Thanks!
Edward

The problem is not caused by a virus, trojan, or anything like that! Yahoo have been making changes to the appearance of their home page and also their e-mail. As a result, the screen resolution of 800 x 600 on many PCs will no-longer allow you to sign in. Try changing your screen resolution to 1024 x 768

This is a new problem with Yahoo mail. :( Ever since they changed the Yahoo mail page to m.www.yahoo. You might try the Yahoo help link at the bottom of their home page or go here: http://help.yahoo.com/l/us/yahoo/mail/classic/ and look for Troubleshooting tips for Yahoo! Mail Issues: IntroductionYou will probably need to delete all the old cookies and history from your browser and then close it and reopen it, then type in the http:///m.www.yahoo.com/ and click the email link. Hope that helps. We've had the same problem!

In IE goto
Tools > Internet Options >
enter http://mail.yahoo.com in the Home page text box
Click Apply
In Safari goto
Settings (icon on the right/wheel) > Preferences
enter http://mail.yahoo.com in the Home page text box
Close the window
In Google Chrome go to
Settings (icon on the right/spanner) > Options
click the Basics tab and enter http://mail.yahoo.com in the Home page text box
Click Close

I didn't get it fixed and I don't think I should have to pay for fixing something that is obviously a yahoo problem, after seeing the mail problems on this site. What a crock to make money on a yahoo goof. I may even discontinue using yahoo completely.

I also have had the problem of the e_mail not loading after a factory reset and had to go to start= go to controlpanel then click internet options and it will bring up a box in the first tab that opens it displays you home page mine had to be changed to my e-mail yahoo account before i could get my mail it was filled in the blank with a redirect, i had to delete that and put in my www.yahoo.com for home page to get mail. I don't know if this is what might help,i am running vista home premium so if you are on another os this procedure my be different. Hope it helps and good luck